micro_state.step = function(micro_state, parms, time) {
is = seq_along(micro_state) - 1
infections = sum(is*micro_state)
N = sum(micro_state)
if (N == 0) return(list(micro_state = micro_state, time_next = Inf))
rates = c(
P_inf = (parms$lambda * infections + parms$lambda_ex)*N,
P_rec = parms$mu * infections,
P_die = parms$alpha * infections + (parms$d * N),
P_birth = parms$r * N * (1 - N/parms$K)
)
#browser()
time_next = time + rexp(1, sum(rates))
event = sample(1:4, 1, prob=rates)
#browser()
switch(event, {
i = sample(is, 1, prob=micro_state)
micro_state[i + 1] = micro_state[i + 1] - 1
if (i < length(micro_state) - 1) {
micro_state[i + 2] = micro_state[i + 2] + 1
}
}, {
i = sample(is, 1, prob = parms$mu * is * micro_state)
micro_state[i+1] = micro_state[i+1] - 1
micro_state[i] = micro_state[i] + 1
}, {
i = sample(is, 1, prob=parms$alpha * is * micro_state + parms$d*micro_state)
micro_state[i+1] = micro_state[i+1] - 1
}, {
micro_state[1] = micro_state[1] + 1
})
return(list(micro_state = micro_state, time_next = time_next))
}
micro_state.stepto = function(micro_state, parms, time, timeto, record=NULL) {
if(!is.null(record)) {
micro_state.record(micro_state, time, connection = record)
}
while(time < timeto) {
out = micro_state.step(micro_state, parms, time)
micro_state = out$micro_state
time = out$time_next
if(!is.null(record)) {
micro_state.record(micro_state, time, connection = record)
}
}
}
micro_state.record = function(micro_state, time, connection) {
writeChar(paste(c(time, micro_state, "\n"), collapse=" "), con=connection, eos=NULL)
}
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